| 摘要 |
Two nested half cylinders, having a concentric axis and closed ends, are pivoted together on aligned pivot pins mounted in the closed ends and on the concentric axis. The nested half cylinders are actuated to pivot 90 degrees oppositely around the concentric axis and aligned pivot pins to close non-compressively around free flowing granular material in a closed cylindrical hoist bucket, thereby saving the additional weight and strength of material and the actuating energy therefor required for compressive loading of hoist buckets having off center or non-concentric axis of pivot. Additionally, the non-compressive loading does not move the granular material nor overflow the closed cylindrical hoist bucket to pollute the environment with dust therefrom.
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